[Boards: 3 / a / aco / adv / an / asp / b / biz / c / cgl / ck / cm / co / d / diy / e / fa / fit / g / gd / gif / h / hc / his / hm / hr / i / ic / int / jp / k / lgbt / lit / m / mlp / mu / n / news / o / out / p / po / pol / qa / r / r9k / s / s4s / sci / soc / sp / t / tg / toy / trash / trv / tv / u / v / vg / vp / vr / w / wg / wsg / wsr / x / y ] [Home]
4chanarchives logo
Archived threads in /sci/ - Science & Math - 8. page
Images are sometimes not shown due to bandwidth/network limitations. Refreshing the page usually helps.

File: EM drive.jpg (39 KB, 638x409) Image search: [Google]
EM drive.jpg
39 KB,
I know I'm behind the times here but what is /sci/'s consensus on the Cannae Drive?
14 replies and 1 images submitted. Click here to view.
>>
They used to call it the meme drive.
Not sure what's changed.
>>
>>8202701
But is it viable? I'm going to try and build one this week out of boredom.
>>
>>8202696
XXI century Dean Machine

File: 200px-Kripke.jpg (14 KB, 200x191) Image search: [Google]
200px-Kripke.jpg
14 KB,
Any /sci/tizens familiar with modal logic?

In particular Kripke models, and Systems K, KT, S4, and S5.

I think I have figured out most of it, but I still have some questions about the whole ordeal.
24 replies and 3 images submitted. Click here to view.
>>
I took a class in it. What are your questions?
>>
>>8202189
>/sci/tizens
Please no.
>>
>>8202204
Sorry for the late reply.

Are you familiar with Getzen Proofs or Beth Tableauxs?

>>8202213
Sorry.

File: Khayyam-paper-1stpage.png (482 KB, 614x833) Image search: [Google]
Khayyam-paper-1stpage.png
482 KB,
How important were muslim contributions to mathematics? Are they overemphasized due to politics?
21 replies and 1 images submitted. Click here to view.
>>
>>8201227
they weren't allowed to paint graven images, so all of their art is mathematical in nature. some of the mosques are extraordinary
>>
They are underrated. Extremely important.
>>
>>8201227
>How important were muslim contributions to mathematics?
Depends how much you consider algebra and the preservation of a lot of European mathematics important.

File: imfucked.jpg (265 KB, 2000x1983) Image search: [Google]
imfucked.jpg
265 KB,
I stopped understanding math or even trying in the fourth grade. Biggest mistake of my life.

I'm about to go to college and I have no path to follow but the usual fine arts and those bullshit courses for dumb people. I'm 20.

Is there still hope for me, /sci/?

Can you guys recommend me a really good book that will give me tons of knowledge? I don't even know how to find out the value of x.

Sorry for being a dumb ni**er. Help me out, I wanna change.
37 replies and 6 images submitted. Click here to view.
>>
>>8199770
Enjoy making burgers for the rest of your life
>>
>>8199770
Alright you fuck, your gonna have to spend hours and hours a day learning now to make up for your past.

You are probably going to want to start at algebra one, try khan academy, or finding pdfs of algebra one math books.

Before you get to college you must at bare minimum be through algebra 2 and geometry.


Alternatively become a welder and make a solid 50-90k a year.
>>
File: 1465809670004.png (3 MB, 1360x2765) Image search: [Google]
1465809670004.png
3 MB, 1360x2765
There is hope for anyone who is willing and prepared to intellectually invest themselves to self-learning. Start with the basics (see pic). Basic math is an absolute fundamental piece to read, and will help your mind re-coordinate to a more academic climate for future learning.

File: 1467569059909.jpg (36 KB, 371x410) Image search: [Google]
1467569059909.jpg
36 KB,
What's the most fringe pseudoscience theory that may be legit?
60 replies and 3 images submitted. Click here to view.
>>
>>8201704
theology
>>
>>8201704
evolution
>>
>>8201704
global warming

File: solar.jpg (106 KB, 720x480) Image search: [Google]
solar.jpg
106 KB,
Will solar energy save us?
251 replies and 18 images submitted. Click here to view.
>>
>>8194879
It already did. The Earth would be a dead snowball without solar energy input.
>>
>>8194879
No.
https://bravenewclimate.com/2014/08/22/catch-22-of-energy-storage/
>>
>>8194928
Just save up water in hydro plants during daytime and price fluctuations will naturally encourage consumers and industries to use power when the sun shines.

File: bush-frustrated-thumb.jpg (72 KB, 450x396) Image search: [Google]
bush-frustrated-thumb.jpg
72 KB,
/sci/, this is frustrating me. Help me out.

Let's say I travel 10 miles at 20 mph - that takes 0.5 hrs.

Now let's say I travel half the distance at 15 mph and the other half at 25 mph. That comes out at 0.5333 hrs.

My question is, why don't they both take 0.5 hrs. Why doesn't travelling 5 mph faster the last half of the distance make up for travelling 5 mph slower the first half of the distance?
17 replies and 2 images submitted. Click here to view.
>>
You're looking at average speed over distance, while you should be looking at average speed over time. The average speed over distance is indeed 20mph (you travel equal distances 15 and 25 mph), but the average speed over time is lower.

The reason it's lower is because you spend less time traveling 25 mph, since it takes less time to cover the 5 miles. So the last half where you're travelling faster can't make up for the first half where you're travelling slower. Lower average speed means a longer travel time, hence the 0.5333 hrs you came up with.
>>
The distance travelled is equal to the average velocity (over the entire trip), multiplied by the time. Since it takes longer to travel 5 miles at 15 mph, the average velocity of the trip is less than 20 mph
>>
>>8203859
ninja'd

File: 8767.png (65 KB, 480x320) Image search: [Google]
8767.png
65 KB,
I don't know a shit about physics, but i have a question:
If somebody "thinks" (processes information) in higher speed than normal person, will this dude see everything in slow motion?
16 replies and 4 images submitted. Click here to view.
>>
Why dude? We have 2 species on this planet co-existing at very different speeds. Women, being unable to evolve quickly are living a life twice as fast as men up to around age 40.
Men have slowed down, mature much much later and last well into their 90's.

Ask a 'chick'
>>
>>8203640
Unverifiable

How would you determine whether one person's second was faster than another person's second? They'd both just say it takes a second.
>>
File: _11_1_7.jpg (130 KB, 1200x1200) Image search: [Google]
_11_1_7.jpg
130 KB, 1200x1200
>>8203654
Damn, i didn't consider that.
Since you're born with it you couldn't be aware.
Buuut.. Couldn't exist a a way to verify it, i mean what if you make a comparison between 2 persons?
I know that both persons will see the same second in the clock, but couldn't you measure their reactions or something like that.
Of course i'm hypothetically talking about somebody that has a noticeable difference in his thinking speed in respect to a regular human.

File: 250px-Covering_space_diagram.svg.png (12 KB, 250x278) Image search: [Google]
250px-Covering_space_diagram.svg.png
12 KB,
Is homomorphism induced by covering map surjective? Does it naturally comes from surjectivity of covering map? Why is Hatcher's book not readable?
12 replies and 1 images submitted. Click here to view.
>>
>>8203430
Are you talking about the homomorphism of fundamental groups?
>>
>>8203506
Yes, sorry
>>
>>8203430
It's not. (the usual example of the reals and the circle).
It's injective, actually, because you can lift path homotopies. Look at the monodromy theorem.

File: 1467876533403.jpg (119 KB, 700x500) Image search: [Google]
1467876533403.jpg
119 KB,
ITT we discuss, how important sight is for scientific advancement.
Let's propose there were a planet where no species evolved eyes, and sonar would be the main form of navigation. Also, there's a species with intelligence comparable to humans. How far could they advance technologically? Would they ever become aware of space existing?
19 replies and 4 images submitted. Click here to view.
>>
>>8203420

Yes.

Now, go away.
>>
>>8203420
>Would they ever become aware of space existing?
Would they have some form of navigation? A sonar, for example?
>>
>>8203453
You baiting? And what I ment was that sonar won't work in vacuum, so they would have no way of gathering info from outer space, so they wouldn't know about stars. They'd have no idea about universe existing

File: canstockphoto6280036.jpg (1 MB, 2727x3000) Image search: [Google]
canstockphoto6280036.jpg
1 MB,
Are games useless/time wasters(feels so to me) and if so what better thing can I do instead to relax.Its mostly because I just feel exhausted when I study even just after 1 hour and dont know how to fix it so I just end up playing games with hours.
41 replies and 3 images submitted. Click here to view.
>>
Depends. If used for sheer escapism, yes. If they're a proxy for self discovery, to immerse yourself in another world, or whatever, in a way that adds to the total spectrum of thoughts and ideas your mind is composed of then no.

This is really too individualized to give an absolute answer, or even lay out a rough heuristic. Depends what you want and find valuable. I haven't played any video games in a few months and feel.. better, I suppose. Only because it broke many of my routines, habits, and mental cycles. ie, I would get real high on stimulants / anxiolytics...
Comment too long. Click here to view the full text.
>>
>>8202983
>what better thing can I do instead to relax
Take a nap. Go for a walk. Exercise. Read a book.
>>
>>8202995
>If they're a proxy for self discovery
I manly use them to improve my communication skills(yes I know how pathetic it sounds)
>deep breaths
I do too but still can focus and just either read the same sentence over and over or want to fall asleep(usually after eating).
>20 hours
well i stay awake around 14 hours (9h sleep) since I understand how important is and I really care about it.

File: Question-Rage-Face.jpg (18 KB, 500x375) Image search: [Google]
Question-Rage-Face.jpg
18 KB,
Blu-Ray Disc's have more storage than Other Discs because the Laser is blue instead of Red. Because blue has a shorter wavelength than red, it can send more information in one second unlike a red laser. Using that logic, Can someone invent Gamma-Ray Inc. where they use a laser with the wavelength of a Gamma Ray (An Uranium Nucleus) and store even more info. Just wondering.

>The laser would be invisible though.
12 replies and 1 images submitted. Click here to view.
>>
>>8202550
>Because blue has a shorter wavelength than red, it can send more information in one second unlike a red laser
This is incorrect. Shorter wavelength means that the information can be stored more densely on the surface of the disk. The laser itself is not sending any information at all.


As to your other point, the answer is no for multiple reasons.
1. gamma radiation produced by nuclear decay is isotropic, meaning it has no preferred direction.
2. gamma and x-ray radiation...
Comment too long. Click here to view the full text.
>>
>>8202550
If you had a gamma ray laser, you'd make more money selling it to the military, I think.
>>
>>8202550
>>8202571

Same poster here. I would like to point out that if the atomic lattice properties of a surface could be manufactured such that it could store data consistently, soft x-ray lasers could be used to read the data. I don't see this as a viable way to store or read information though. Equipment like this is quite large and essentially useless outside a laboratory setting.

File: Artificial_Life.png (195 KB, 598x200) Image search: [Google]
Artificial_Life.png
195 KB,
Artificial life thread.
What's the best artificial life simulation out there /sci/?
12 replies and 2 images submitted. Click here to view.
>>
>>8202192
"Best" is relative; it depends on what exactly you're looking for. Every Alife sim sucks at something, and is most interesting in a particular area of focus.

Question: Are there any alife systems you know of that focus on developmental biology, where the organism's structure isn't directly determined by genetics but instead develops from a simpler structure according to a program encoded by the genome? I suspect this could be an interesting aspect to play with, as structures that arise...
Comment too long. Click here to view the full text.
>>
>>8202200
(HyperNEAT is related but not quite what I'm thinking of; I'd prefer something where the structure-producing process is emergent from the behavior and interactions of individual organism components.)
>>
>>8202192
Being on 4chan

File: tumblr_oa8eanCWs31u84jm3o1_1280.png (1007 KB, 1280x1230) Image search: [Google]
tumblr_oa8eanCWs31u84jm3o1_1280.png
1007 KB,
Are you guys excited for the Juno mission? What do you think the results will be?
23 replies and 3 images submitted. Click here to view.
>>
we already had hi-res photos of jupiter. i dont think its gonna be a big deal at all
>>
>>8202035
>>8202042
We've had medium resolution pics from hubble, and a couple high resolution pics from fly-bys

juno will take countless high resolution pictures over a long period of time, studying the planet in great detail

i think this is a pretty big deal, and then there's the fact that we might finally figure out the interior of jupiter
>>
>>8202064
Well its just jupiter, nothing but gas and shit in there. I don't know how it would be beneficial.

File: wd950403.gif (268 KB, 1024x768) Image search: [Google]
wd950403.gif
268 KB,
Someone redpill me on the fourier transform please.
24 replies and 4 images submitted. Click here to view.
>>
additive synthesis
>>
>>8201961
On compact topological groups it's a corollary of Peter-Weyl theorem. On locally compact abelian groups it's a corollary of the definition of the Pontryagin dual.
>>
>>8201996

wtf! i'm a #wildbergermissile now

banner
banner
Pages: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [50] [51] [52] [53] [54] [55] [56] [57] [58] [59] [60] [61] [62] [63] [64] [65] [66] [67] [68] [69] [70] [71] [72] [73] [74] [75] [76] [77] [78] [79] [80] [81] [82] [83] [84] [85] [86] [87] [88] [89] [90] [91] [92] [93] [94] [95] [96] [97] [98] [99] [100] [101] [102] [103] [104] [105] [106] [107] [108] [109] [110] [111] [112] [113] [114] [115] [116] [117] [118] [119] [120] [121] [122] [123] [124] [125] [126] [127] [128] [129] [130] [131] [132] [133] [134] [135] [136] [137] [138] [139] [140] [141] [142] [143] [144] [145] [146] [147] [148] [149] [150] [151] [152] [153] [154] [155] [156] [157] [158] [159] [160] [161] [162] [163] [164] [165] [166] [167] [168] [169] [170] [171] [172] [173] [174] [175] [176] [177] [178] [179] [180] [181] [182] [183] [184] [185] [186] [187] [188] [189] [190] [191] [192] [193] [194] [195] [196] [197] [198] [199] [200] [201] [202] [203] [204] [205] [206] [207] [208] [209] [210] [211] [212] [213] [214] [215] [216] [217] [218] [219] [220] [221] [222] [223] [224] [225] [226] [227] [228] [229] [230] [231] [232] [233] [234] [235] [236] [237] [238] [239] [240] [241] [242] [243] [244] [245] [246] [247] [248] [249] [250] [251] [252] [253] [254] [255] [256] [257] [258] [259] [260] [261] [262] [263] [264] [265] [266] [267] [268] [269] [270] [271] [272] [273] [274] [275] [276] [277] [278] [279] [280] [281] [282] [283] [284] [285] [286] [287] [288] [289] [290] [291] [292] [293] [294] [295] [296] [297] [298] [299] [300] [301] [302] [303] [304] [305] [306] [307] [308] [309] [310] [311] [312] [313] [314] [315] [316] [317] [318] [319] [320] [321] [322] [323] [324] [325] [326] [327] [328] [329] [330] [331] [332] [333] [334] [335] [336] [337] [338] [339] [340] [341] [342] [343] [344] [345] [346] [347] [348] [349] [350] [351] [352] [353] [354] [355] [356] [357] [358] [359] [360] [361] [362] [363] [364] [365] [366] [367] [368] [369] [370] [371] [372] [373] [374] [375] [376] [377] [378] [379] [380] [381] [382] [383] [384] [385] [386] [387] [388] [389] [390] [391] [392] [393] [394] [395] [396] [397] [398] [399] [400] [401] [402] [403] [404] [405] [406] [407] [408] [409] [410] [411] [412] [413] [414] [415] [416] [417] [418] [419] [420] [421] [422] [423] [424] [425] [426] [427] [428] [429] [430] [431] [432] [433] [434] [435] [436] [437] [438] [439] [440] [441] [442] [443] [444] [445] [446] [447] [448] [449] [450] [451] [452] [453] [454] [455] [456] [457] [458] [459] [460] [461] [462] [463] [464] [465] [466] [467] [468] [469] [470] [471] [472] [473] [474] [475] [476] [477] [478] [479] [480] [481] [482] [483] [484] [485] [486] [487] [488] [489] [490] [491] [492] [493] [494] [495] [496] [497] [498] [499] [500] [501] [502] [503] [504] [505] [506] [507] [508] [509] [510] [511] [512] [513] [514] [515] [516] [517] [518] [519] [520] [521] [522] [523] [524] [525] [526] [527] [528] [529] [530] [531] [532] [533] [534] [535] [536] [537] [538] [539] [540] [541] [542] [543] [544] [545] [546] [547] [548] [549] [550] [551] [552] [553] [554] [555] [556] [557] [558] [559] [560] [561] [562] [563] [564] [565] [566] [567] [568] [569] [570] [571] [572] [573] [574] [575] [576] [577] [578] [579] [580] [581] [582] [583] [584] [585] [586] [587] [588] [589] [590] [591] [592] [593] [594] [595] [596] [597] [598] [599] [600] [601] [602] [603] [604] [605] [606] [607] [608] [609] [610] [611] [612] [613] [614] [615] [616] [617] [618] [619] [620] [621] [622] [623] [624] [625] [626] [627] [628] [629] [630] [631] [632] [633] [634] [635] [636] [637] [638] [639] [640] [641] [642] [643] [644] [645] [646] [647] [648] [649] [650] [651] [652] [653] [654] [655] [656] [657] [658] [659] [660] [661] [662] [663] [664] [665] [666] [667]
Pages: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [50] [51] [52] [53] [54] [55] [56] [57] [58] [59] [60] [61] [62] [63] [64] [65] [66] [67] [68] [69] [70] [71] [72] [73] [74] [75] [76] [77] [78] [79] [80] [81] [82] [83] [84] [85] [86] [87] [88] [89] [90] [91] [92] [93] [94] [95] [96] [97] [98] [99] [100] [101] [102] [103] [104] [105] [106] [107] [108] [109] [110] [111] [112] [113] [114] [115] [116] [117] [118] [119] [120] [121] [122] [123] [124] [125] [126] [127] [128] [129] [130] [131] [132] [133] [134] [135] [136] [137] [138] [139] [140] [141] [142] [143] [144] [145] [146] [147] [148] [149] [150] [151] [152] [153] [154] [155] [156] [157] [158] [159] [160] [161] [162] [163] [164] [165] [166] [167] [168] [169] [170] [171] [172] [173] [174] [175] [176] [177] [178] [179] [180] [181] [182] [183] [184] [185] [186] [187] [188] [189] [190] [191] [192] [193] [194] [195] [196] [197] [198] [199] [200] [201] [202] [203] [204] [205] [206] [207] [208] [209] [210] [211] [212] [213] [214] [215] [216] [217] [218] [219] [220] [221] [222] [223] [224] [225] [226] [227] [228] [229] [230] [231] [232] [233] [234] [235] [236] [237] [238] [239] [240] [241] [242] [243] [244] [245] [246] [247] [248] [249] [250] [251] [252] [253] [254] [255] [256] [257] [258] [259] [260] [261] [262] [263] [264] [265] [266] [267] [268] [269] [270] [271] [272] [273] [274] [275] [276] [277] [278] [279] [280] [281] [282] [283] [284] [285] [286] [287] [288] [289] [290] [291] [292] [293] [294] [295] [296] [297] [298] [299] [300] [301] [302] [303] [304] [305] [306] [307] [308] [309] [310] [311] [312] [313] [314] [315] [316] [317] [318] [319] [320] [321] [322] [323] [324] [325] [326] [327] [328] [329] [330] [331] [332] [333] [334] [335] [336] [337] [338] [339] [340] [341] [342] [343] [344] [345] [346] [347] [348] [349] [350] [351] [352] [353] [354] [355] [356] [357] [358] [359] [360] [361] [362] [363] [364] [365] [366] [367] [368] [369] [370] [371] [372] [373] [374] [375] [376] [377] [378] [379] [380] [381] [382] [383] [384] [385] [386] [387] [388] [389] [390] [391] [392] [393] [394] [395] [396] [397] [398] [399] [400] [401] [402] [403] [404] [405] [406] [407] [408] [409] [410] [411] [412] [413] [414] [415] [416] [417] [418] [419] [420] [421] [422] [423] [424] [425] [426] [427] [428] [429] [430] [431] [432] [433] [434] [435] [436] [437] [438] [439] [440] [441] [442] [443] [444] [445] [446] [447] [448] [449] [450] [451] [452] [453] [454] [455] [456] [457] [458] [459] [460] [461] [462] [463] [464] [465] [466] [467] [468] [469] [470] [471] [472] [473] [474] [475] [476] [477] [478] [479] [480] [481] [482] [483] [484] [485] [486] [487] [488] [489] [490] [491] [492] [493] [494] [495] [496] [497] [498] [499] [500] [501] [502] [503] [504] [505] [506] [507] [508] [509] [510] [511] [512] [513] [514] [515] [516] [517] [518] [519] [520] [521] [522] [523] [524] [525] [526] [527] [528] [529] [530] [531] [532] [533] [534] [535] [536] [537] [538] [539] [540] [541] [542] [543] [544] [545] [546] [547] [548] [549] [550] [551] [552] [553] [554] [555] [556] [557] [558] [559] [560] [561] [562] [563] [564] [565] [566] [567] [568] [569] [570] [571] [572] [573] [574] [575] [576] [577] [578] [579] [580] [581] [582] [583] [584] [585] [586] [587] [588] [589] [590] [591] [592] [593] [594] [595] [596] [597] [598] [599] [600] [601] [602] [603] [604] [605] [606] [607] [608] [609] [610] [611] [612] [613] [614] [615] [616] [617] [618] [619] [620] [621] [622] [623] [624] [625] [626] [627] [628] [629] [630] [631] [632] [633] [634] [635] [636] [637] [638] [639] [640] [641] [642] [643] [644] [645] [646] [647] [648] [649] [650] [651] [652] [653] [654] [655] [656] [657] [658] [659] [660] [661] [662] [663] [664] [665] [666] [667]
[Boards: 3 / a / aco / adv / an / asp / b / biz / c / cgl / ck / cm / co / d / diy / e / fa / fit / g / gd / gif / h / hc / his / hm / hr / i / ic / int / jp / k / lgbt / lit / m / mlp / mu / n / news / o / out / p / po / pol / qa / r / r9k / s / s4s / sci / soc / sp / t / tg / toy / trash / trv / tv / u / v / vg / vp / vr / w / wg / wsg / wsr / x / y] [Home]

All trademarks and copyrights on this page are owned by their respective parties. Images uploaded are the responsibility of the Poster. Comments are owned by the Poster.
If a post contains personal/copyrighted/illegal content you can contact me at [email protected] with that post and thread number and it will be removed as soon as possible.
DMCA Content Takedown via dmca.com
All images are hosted on imgur.com, send takedown notices to them.
This is a 4chan archive - all of the content originated from them. If you need IP information for a Poster - you need to contact them. This website shows only archived content.